GunBroker takes care of all the taxes for you. They are required to do so by law now. So it's a seamless process for you. They put the notifications in the auction and do the calculations for the shipping address and add it all up and give the total price to the buyer who PAYS YOU the total. At the end of the month, GunBroker automatically charges your account for all the taxes (and auction fees like they always did) you've collected that month, and then forwards them to the states that get them.